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Kinetic Behavior in Melt State and Solid State Polymerization of Lactide Using Magnesium Stearate as Catalyst

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Abstract

Solid state polymerizations (SSP) and the kinetic behavior in melt state of l-lactide polymerizations employing magnesium stearate as catalyst were investigated. The solid state polymerizations were carried out in two steps where pre-polymers were first prepared in melt polymerizations at 180 °C and the subsequent post-polymerizations were performed around the Tc of polylactide (PLA). In order to find the initial SSP conditions, kinetic profiles of melt polymerizations of l-lactide with magnesium stearate were determined. According to the kinetics data the melt polymerizations were found to be first order with respect to lactide as evident from a linear relationship of logarithmic variations of l-lactide concentration versus time using catalyst/monomer ratios of 1:500 and 1:5,000. When the catalyst content is increased to 1:100 the relationship loses its linearity due to fast propagation in the early stages of the reaction. From the GPC data it can be noted that the molecular weight of PLA can be increased by 5–17 times under the conditions established for our SSP experiments. A comparison between the two step solid state polymerizations and already reported melt polymerizations using the same catalyst showed that SSP furnished polymers with much lower amount of polymer degradation.

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Acknowledgments

The authors are grateful to the financial support of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Authors and Affiliations

  1. Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, Av. Horácio Macedo, 2030, Centro de Tecnologia, Bloco J, CP 68525, Rio de Janeiro, RJ, 21941-598, Brazil

    Alexandre Carneiro Silvino, Danielle Bonilha de Abreu Talina Martins, Aline da Costa Rodrigues & Marcos Lopes Dias

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  1. Alexandre Carneiro Silvino
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  2. Danielle Bonilha de Abreu Talina Martins
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  3. Aline da Costa Rodrigues
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  4. Marcos Lopes Dias
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Correspondence to Alexandre Carneiro Silvino.

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Silvino, A.C., de Abreu Talina Martins, D.B., da Costa Rodrigues, A. et al. Kinetic Behavior in Melt State and Solid State Polymerization of Lactide Using Magnesium Stearate as Catalyst. J Polym Environ 21, 1002–1008 (2013). https://doi.org/10.1007/s10924-013-0603-1

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